<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>继承和叠加</title>
	<style type="text/css">
		p{
			color: red;
			font-size: 20px;
		}
		a{
			color: red;
		}
		#title{
			color: blue;
		}
		.title{
			color: green;
		}


	</style>
</head>
<body>
	<p>这个是个p标签 <span>这个是一个span</span></p>

	<a id="title" class="title" style="color:yellow" href="">这个是一个a标签</a>
</body>
</html>